<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        ul{
            margin: 10px auto;
            width: 600px;
            height: 400px;
            border: 5px solid gray;
            list-style: none;
            position: relative;
           
        }
        ul li:not(:nth-child(7)){
            opacity: 0;
        }
        ul:hover li{
            opacity: 1;
        }
        li{
            width: 60px;
            height: 200px;
            position: absolute;
            left:50% ;
            margin-left: -30px;
            bottom: 30px;
            text-align: center;
            /* 调整中心点 */
            transform-origin:bottom center ;
            border-radius: 10px;
            transition: all 2s;

        }
        ul li:nth-child(1),ul li:nth-child(13){
            background-color: purple;
        }
        ul li:nth-child(2),ul li:nth-child(12){
            background-color: darkblue;
        }
        ul li:nth-child(3),ul li:nth-child(11){
            background-color: deeppink;
        }
        ul li:nth-child(4),ul li:nth-child(10){
            background-color: deepskyblue;
        }
        ul li:nth-child(5),ul li:nth-child(9){
            background-color: green;
        }
        ul li:nth-child(6),ul li:nth-child(8){
            background-color: yellow;
        }
        ul li:nth-child(7){
            background-color: red;
        }
        ul:hover li:nth-child(1){
            transform:rotate(90deg) ;
        }
        ul:hover li:nth-child(13){
            transform:rotate(-90deg) ;
        }
        ul:hover li:nth-child(2){
            transform:rotate(75deg) ;
        }
        ul:hover li:nth-child(12){
            transform:rotate(-75deg) ;
        }
        ul:hover li:nth-child(3){
            transform:rotate(60deg) ;
        }
        ul:hover li:nth-child(11){
            transform:rotate(-60deg) ;
        }
        ul:hover li:nth-child(4){
            transform:rotate(45deg) ;
        }
        ul:hover li:nth-child(10){
            transform:rotate(-45deg) ;
        }
        ul:hover li:nth-child(5){
            transform:rotate(30deg) ;
        }
        ul:hover li:nth-child(9){
            transform:rotate(-30deg) ;
        }
        ul:hover li:nth-child(6){
            transform:rotate(15deg) ;
        }
        ul:hover li:nth-child(8){
            transform:rotate(-15deg) ;
        }
    </style>
</head>
<body>
    <ul>
       <li>1</li>
       <li>2</li>
       <li>3</li>
       <li>4</li>
       <li>5</li>
       <li>6</li>
       <li>7</li>
       <li>8</li>
       <li>9</li>
       <li>10</li>
       <li>11</li>
       <li>12</li>
       <li>13</li> 
    </ul>
</body>
</html>